1. Department of Otolaryngology–Head and Neck Surgery, The first affiliated hospital of Ningbo University, Ningbo, China
2. Department of Otorhinolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, Jinan, China
3. Department of Pathology, Jinan Fourth People’s Hospital, Jinan, China
4. Department of Otorhinolaryngology-Head and Neck Surgery, Linyi People’s Hospital, Linyi, China.